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* [Bug math/31104] New: Sign inconsistencies with various log functions
@ 2023-11-30 23:54 mwelinder at gmail dot com
2023-12-01 7:59 ` [Bug math/31104] " schwab@linux-m68k.org
0 siblings, 1 reply; 2+ messages in thread
From: mwelinder at gmail dot com @ 2023-11-30 23:54 UTC (permalink / raw)
To: glibc-bugs
https://sourceware.org/bugzilla/show_bug.cgi?id=31104
Bug ID: 31104
Summary: Sign inconsistencies with various log functions
Product: glibc
Version: 2.35
Status: UNCONFIRMED
Severity: normal
Priority: P2
Component: math
Assignee: unassigned at sourceware dot org
Reporter: mwelinder at gmail dot com
Target Milestone: ---
printf ("%+.12g %+.12g %+.12g %+.12g\n", log (-42), log2 (-42), log10 (-42),
log1p (-43));
printf ("%+.12g %+.12g %+.12g %+.12g\n", logf (-42), log2f (-42), log10f
(-42), log1pf (-43));
printf ("%+.12Lg %+.12Lg %+.12Lg %+.12Lg\n", logl (-42), log2l (-42), log10l
(-42), log1pl (-43));
gives me...
-nan -nan +nan -nan
-nan -nan +nan -nan
+nan +nan +nan -nan
That's just all over the place!
That sign inconsistency seems silly, even if the standards might allow it.
GNU C Library (Ubuntu GLIBC 2.35-0ubuntu3.4) stable release version 2.35.
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* [Bug math/31104] Sign inconsistencies with various log functions
2023-11-30 23:54 [Bug math/31104] New: Sign inconsistencies with various log functions mwelinder at gmail dot com
@ 2023-12-01 7:59 ` schwab@linux-m68k.org
0 siblings, 0 replies; 2+ messages in thread
From: schwab@linux-m68k.org @ 2023-12-01 7:59 UTC (permalink / raw)
To: glibc-bugs
https://sourceware.org/bugzilla/show_bug.cgi?id=31104
--- Comment #1 from Andreas Schwab <schwab@linux-m68k.org> ---
The sign of NaN is irrelevant, so there is nothing wrong with this.
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2023-11-30 23:54 [Bug math/31104] New: Sign inconsistencies with various log functions mwelinder at gmail dot com
2023-12-01 7:59 ` [Bug math/31104] " schwab@linux-m68k.org
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